O'Day 25 vs O'Day 30
How do the O'Day 25 and O'Day 30 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
O'Day 25 
O'Day 30 | O'Day 25 | O'Day 30 | |
|---|---|---|
| Length overall | 24.8 ft7.57 m | 29.9 ft9.12 m |
| Waterline length | 21.0 ft6.40 m | 25.4 ft7.75 m |
| Beam | 8.0 ft2.44 m | 10.8 ft3.28 m |
| Draft | 2.3 ft0.69 m | 4.9 ft1.49 m |
| Displacement | 4,007 lb1,818 kg | 10,150 lb4,604 kg |
| Ballast | 1,825 lb828 kg | 4,000 lb1,814 kg |
| Sail area | 269 ft²25.0 m² | 441 ft²41.0 m² |
| SA / Displacement | 17.06 | 15.05 |
| Displacement / Length | 193 | 276 |
| Comfort ratio | 17.5 | 24.8 |
| Capsize screening | 2.01 | 1.99 |
| Hull speed (kn) | 6.1 | 6.8 |
O'Day 25 vs O'Day 30: the short version
- The O'Day 30 is the larger boat at 29.9 ft9.12 m LOA versus 24.8 ft7.57 m for the O'Day 25.
- The O'Day 30 is heavier, displacing about 153% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the O'Day 25 carries the more powerful rig (17.1 vs 15.1), favouring lighter-air performance.
- The O'Day 30 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the O'Day 30 rates better for offshore work (1.99 vs 2.01).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.